The Archbishop of Dublin, Dr Desmond Connell, has expressed disappointment at developments in Northern Ireland.
Speaking at a vigil Mass in the Pro-Cathedral on Saturday, he said: "It has been a disappointing week for the promotion of peace in Northern Ireland.
"It is always easy to make statements, but not easy to anticipate their impact on a delicate process.
"I wish to reaffirm hope at this difficult time and to encourage constant prayer throughout the diocese for the gift of peace.
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"May the God of peace grant this gift for which we long and for which many have laboured with tireless generosity."